The Alien Revolution is the third generation of the model originally designed by David Wagoner. The Revolution includes the strengths of the original model, such as soft aluminum cams for better grip and increased safety, and a protected flexible stem. It has an improved geometry to avoid contact with the rock and to facilitate the placement. The new component parts are replaceable, facilitating their repair. New aluminum components: such as the upper and lower-side are colored to identify the size of each piece. Features Materials: aluminum, dyneema, stainless steel and plastic Sizes: six sizes available